<?phpclass ExhibitExhibitorViewModel extends ViewModel{	 public $viewFields = array(		'exhibit'=>array('id','name_cn','name_en','user_id','modifytime',		'level1_name','level2_name','level3_name','validity_period_name','is_verified','status'),		'exhibitor'=>array('id'=>'exhibitor_id','name_cn'=>'exhibitor_name','type_name','user_id'=>'uid',		'_on'=>'exhibitor.user_id=exhibit.user_id'),    );}?>